Loudspeaker measure and crossover design

[05cordie]

I have developped a new freeware which may interest you. You will be able to measure loudspeaker with it and to design crossovers. The main features are :

Frequency response measurement
Phase response measurement
Impedance measurement
Minimal phase computing
Acoustical center computing
MLS (Maximum length sequences) signal generator
Impulse response measurement
Crossover simulation
Waterfal diagram (CSD : cumulative spectral decay) computing
Curve visualizing
Waterfall diagram visualizing

You can dowload it at http://sofmea.fr/Download.php

I will be glad to have your feedbak. I can developp some extra tools if you need some. Please feel free to ask any question.

 

[mickeymoose]

Feedback: (don't ever say that to a roadie!)

Your link did not work for me but I got there via SOFMEA - Accueil. Thanks for providing the site in Enlish
The download worked fine (also in English) and the program came up. All in French. I will bring out my dictionary, proceed and report back

Thanks for sharing! E

 

[05cordie]

If you want the freeware in english, you can edit the config.txt file, writing 'EN' on the second line and everything will be in English...

 

[tvrgeek]

I'll give it a test. I use SoundEasy now. I also keep going back to WT-2 and TrueRta.

 

[ChrisA]

I have developped a new freeware which may interest you.

Looks like an .exe file. Those only run on Windows PCs. Can you make a .zip or .tar file of the source available?

 

[a.wayne]

I will give this ago .......... Thanks !!!!

 

[ChrisA]

I will give this ago .......... Thanks !!!!

Look carefully at the licenses used by GNU Plot and by Audicity and use whichever you like but do pick something.

Details are here.
Licenses - GNU Project - Free Software Foundation (FSF)

 

[05cordie]

Audacity and Gnuplot are to be used as stand alone applications combined with Sofmea, but there is no piece of code of it inside Sofmea.

I'm not sure giving the whole source code is a good idea, but I can eventually try to compile the soft on linux if you are intersted.

 

[05cordie]

Optimization feature

I put the V1.0 online today. There is a major improvement in computing speed (impulse response as an example). There is also a new optimization feature available in the simulation interface. You need a code in order to activate this feature, but you can get a free one here.http://sofmea.fr/Page.php?demande

 

[05cordie]

Sofmea V1.1 is online with

• A new interface organization
• New messages concerning the file format
• Minor bug fixes
• The possibility to save curves in the simulation or optimization interface
• Viewing of the mouse coordinates in the visualization interface

I'm waiting for your ideas... Feel free to ask for a free registration code to get access to the optimization feature !

 

[Pano]

I downloaded and will give it a try.

05? You're in the Alps?

 

[05cordie]

Hello,
Sorry to see your message only today... I'm not in the Alps, I'm living near Nancy. The 05 is because of the year. If you want to test the optimization tool, I need to know your Site Code and Machine Id, wich are available when you click on the "optimize" button in the software (Simulation and optimization interface).
I you have any question, feel free to ask it...

 

[jayam000]

Thanks for software.
today i have downloaded & will install shortly.
Have u made any user manual/guideline so that we can use software properly.

 

[05cordie]

Tutorials are available here : Learn how to use the loudspeaker design software Sofmea
If you have further questions, feel free to ask it per mail or here on the forum.

 

[jaya000]

I want to make crossover for 2 way PA cabinet. Do i need to measure frequency & phase response of the drivers installed in the cabinet or without cabinet? Further if need to measure just drivers without cabinet, in that case the compression driver frequency response is to be measured with the horn fitted?

 

[jaya000]

Is it ok to take impedance curve of compression driver fitted on a horn?

 

[05cordie]

You have to measure the drivers in the cabinet in order to take the cabinet effect into account and to build a crossover that match this effect.

"Is it ok to take impedance curve of compression driver fitted on a horn?"
I would give you the same answer : you have to get the impedance of the driver in the cabinet with the horn because it impacts the impedance curve.

 

[jaya000]

Thanks for your prompt & informative reply.

 

[jaya000]

How to measure impedance of two same woofers in one box?

 

[05cordie]

If the two woofers are in line, you have to measure the two woofers at the same time, that is to say : mesure between the minus of the first woofer and the plus of the second, nd link the woofers with the other plus and minus... Then you have to consider you have only one driver.
If they are in parallel, but on the same crossover filter : measure them at the same time too... But take the plus and the minus of only one driver (the second driver is directly linked to the first)
If they are not or will not be linked to the same crossover : measure them separately.